github.com/lovishpuri/go-40569/src@v0.0.0-20230519171745-f8623e7c56cf/runtime/cgo/asm_386.s (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  #include "textflag.h"
     6  
     7  // Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
     8  // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2
     9  TEXT ·set_crosscall2(SB),NOSPLIT,$0-0
    10  	MOVL	_crosscall2_ptr(SB), AX
    11  	MOVL	$crosscall2(SB), BX
    12  	MOVL	BX, (AX)
    13  	RET
    14  
    15  // Called by C code generated by cmd/cgo.
    16  // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
    17  // Saves C callee-saved registers and calls cgocallback with three arguments.
    18  // fn is the PC of a func(a unsafe.Pointer) function.
    19  TEXT crosscall2(SB),NOSPLIT,$28-16
    20  	MOVL BP, 24(SP)
    21  	MOVL BX, 20(SP)
    22  	MOVL SI, 16(SP)
    23  	MOVL DI, 12(SP)
    24  
    25  	MOVL	ctxt+12(FP), AX
    26  	MOVL	AX, 8(SP)
    27  	MOVL	a+4(FP), AX
    28  	MOVL	AX, 4(SP)
    29  	MOVL	fn+0(FP), AX
    30  	MOVL	AX, 0(SP)
    31  	CALL	runtime·cgocallback(SB)
    32  
    33  	MOVL 12(SP), DI
    34  	MOVL 16(SP), SI
    35  	MOVL 20(SP), BX
    36  	MOVL 24(SP), BP
    37  	RET